This list should be a lot longer. Overlaps with Action/Adventure but still... should be a lot more.

Arabesque (1966)
Black Book (Dutch, 2006)
The Bourne Identity (2002)
Casablanca (1942)
The Day of the Jackal (1973)
The Man from U.N.C.L.E. (2015)
The Spy Who Came in from the Cold (1965)
Syriana (2005)
True Lies (1994)

10 Things I Hate About You (1999)
A Fish Called Wanda (1988)
The Gods Must be Crazy (1980)
Men in Black
Galaxy Quest (1999)
Ghostbusters (1984)
The Man with One Red Shoe (1985)
Monty Python's Life of Brian
My Big Fat Greek Wedding
My Stepmother Is an Alien (1988)
Office Space
Ruthless People (1986)
Sneakers (1992)
Soapdish (1991)
This is Spinal Tap
The Valet

Railroad

Closely Watched Trains
The Color of a Brisk and Leaping Day (1996)
The Narrow Margin
A Railway in the Cloud (2007)
The Train (1964)
The Great India Railway (National Geographic)

Transportation (other than rail)

Night Flight (1933)

Music

The Commitments (1991)
Crazy Heart
Rock Around the Clock (1956)
That Thing You Do! (1996)

The World of Men

Because, contrary to popular belief, this is rarely done well.

The Best Years of our Lives (1946)
Das Boot
The Full Monty
The Intern (2015)
Shall We Dance? (the Japanese one)
Super Bridge (Nova, documentary)

The World of the Mind

Has this ever really been done well? To show creativity, and how it feels to be inside that creativity? As opposed to showing the creative person as just wonderfully wacky? Some partial successes.

A Beautiful Mind (2001)
Amadeaus (1984)

Political

All the King's Men (the 1949 one)
An Inconvenient Truth (Documentary)
The Battle of Algiers
The Breakfast Club
Children of Men (2006)
The China Syndrome
Control Room (Documentary)
Gandhi
Hunger Games
Invictus
The Lives of Others (2007)
A Man for All Seasons
Missing (1982)
Network
Never Cry Wolf
Pump Up the Volume
Silkwood
Syriana (2005)
Thunderheart
Wag the Dog
Z (1969)

Religion

A Man for all Seasons
Life of Brian
Shoes of the Fisherman

Sports

Should probably be a subdivision of Guilty Pleasures

A League of their Own (1992)
Breaking Away
Bull Durham
Cool Runnings (1993)
Hoosiers
Major League
Million Dollar Baby
Moneyball
Invictus (2009)
The Replacements (2000)
Tin Cup

Guilty Pleasures

While normal standards of quality are omitted for this category, the movie still has to have some redeeming feature.

The American (2010) - Yea, a lot of cliches in this one. But the villages... and the use of tension rather than bullets.

Beyond the Valley of the Dolls (1970) - Roger Ebert wrote it, for crying out loud. Also, the Strawberry Alarm Clock doing a song that isn't the one you know.

Cannibal Women in the Avocado Jungle of Death (1989) - For the title, mostly, and for casting . Shannon Tweed as a Feminist Studies Prof & Bill Maher as hopeless.